HYPET calculations are approved by many authorities all over Europe, we can mention NMD, DNV, GL, ABS, BV, RINA, and RS.
Latest approval: Date 12 Sep. 2013 from Russian RS - RUSSIAN MARITIME REGISTER OF SHIPPING. 
This was a type approval certificate for HYPET general and HYPET Loading Calculator H600w, Approval Certificate 13.00958.314-1